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Old 04-23-2007, 02:35 AM   #1
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Dash air has stopped cooling. The connections and interfaces seem automotive in type, and I was wondering if anyone has serviced a A/C unit on a Spartan Mountain Master chassis, circa 2002.
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Old 04-23-2007, 02:35 AM   #2
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Dash air has stopped cooling. The connections and interfaces seem automotive in type, and I was wondering if anyone has serviced a A/C unit on a Spartan Mountain Master chassis, circa 2002.
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Old 08-07-2007, 06:35 PM   #3
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ua40j: Just checking to see if you got this fixed. I am having the same problem with my new Ultimate Freedom...thx!!!
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Old 08-08-2007, 02:22 AM   #4
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craigt,

I did get it fixed....for a while. I put in refrigerant and stop leak as recommended, but the cooling fans on the radiator did not come on nor did the compressor turn. I had a mobile technician look at it and he found a connector on the compressor was corroded. That repair got the compressor going, but still no cooling fans.

Took the cooling fans off and found both to be rusted stiff. Replaced both with fans from auto parts store and had A/C for about a month.

Now I have discovered a leak somewhere and I'm looking for it.

As for servicing, the connections are automotive and in the front next to the heater core. My low pressure cap is blue, yours may be a different color so look for the larger A/C line going to heater core. Auto parts stores sell a combo pressure guage and fill can and I do recommend using a guage.

The servicing process is fairly straight forward. Start engine and turn on A/C to max. If A/C compressor turns on, check pressure in line and if low, fill with refrigerant. Always make sure you keep the can upright so only vapor enters the system. Start slowly, adding only 1 can (13oz) at a time.

If no compressor (it won't come on for various reasons, one of which is no refrigerant), only add 1 can. If compressor still doesn't come on, need a professional to look at it. You can overpressurize your system, so be cautious.

Hope that helps.
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Old 08-08-2007, 04:23 AM   #5
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Jim: Thanks! I will take a look at all this today. My rig has sat unused for 2.5 years! Everything needs to be looked at closely!

I will let you find out what happens...
Craig
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Old 08-08-2007, 05:23 AM   #6
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Holy cow!

The a/c is just the tip of the iceberg. If you need an approach on how to confirm condition of stuff, I have a few recommendations. Let me know if you're interested.
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Old 09-23-2007, 01:58 PM   #7
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I wanted to let you all know that the airconditioner is finally fixed. And I learned an important tip which I'm passing on.

As I noted previously, I lost A/C, got it back, lost the A/C fans, replaced them. Lost the A/C again.

Well, it's fixed now. There is ONE wire on the compressor (yep, only one that I could find). It has a connector 8 inches down from where it enters the compressor. We thought it was clean, but turns out that this thing corrodes fairly easily. The whole time the A/C was not running the second time was because this connector had corroded contacts.

So if your A/C just stops working for no apparent reason, check that wire/connector first. Could save you a lot of refrigerant and time and effort.
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Old 09-23-2007, 06:24 PM   #8
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UA40J We have an '02 UA40J also. Thanks for the A/C "heads up".
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Old 09-24-2007, 04:33 AM   #9
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I wonder if this is the same wire that fried on mine two years ago. When tech called the Manf he was told it was probably either corroded contacts or a loose contact. He replaced and haven't had the problem again. It affected #2 compressor only.
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Old 09-24-2007, 11:28 AM   #10
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Does anyone know what the pressure's are supposed to be on the Dash Air system?

I had some problems a while back, and traced it to bad cooling fans on the condenser. I replaced them with generic fans from Advance (they looked identical). I also put a can of freon in the system since on the low side I was reading 25lbs, the can didn't seem to raise it any. It is cooling, but seems like it could be cooling more. I have not taken a temp reading yet.

The other curious thing I question do the fans blow air through the condenser or pull air out? Mine blow it through, which I find slightly strange that they would plan to put more hot air into the engine compartment, but on the other hand I don't know that it would make sense to suck in hot air out of the engine compartment.

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Old 09-24-2007, 11:51 AM   #11
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Last year we lost front a/c -- two problems

1. a little low on coolant

2. big problem was that the vac. tube that goes up under the dash by the driver had disconnected -- so not getting switch to change all the way from heat to cool on the dash control

Bill
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Old 09-24-2007, 12:55 PM   #12
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John, if I correlate your '25lbs' to the gauge that I got with my can of R134, then your system would be 'low' on my scale. My gauge has a 'full' range of 25-45. The system is automotive, so the stuff at AutoZone and other places works on the connections in my coach. (large pipe in front above generator with blue cap) You may want to invest in one of those guages (about $15). The fans I put on, I put on in the same direction as the main radiator fan. So, I blow hot air into the engine compartment as that is the way the air goes into the radiator. If it went the other way, it would probably cause less efficient cooling.

Bill...thanks for the vac hose tip. I had that happen once and had forgot about it.

By the way...using the gauge that came with my can of R134, I have put 4 cans of refrigerant into my system, 1 can of stop leak, and 1 can of refrigerant oil. I remain in the 'filled' zone and the A/C works great.
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Old 09-24-2007, 01:12 PM   #13
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The refrigerant system stop leak is a BAD thing. It will generally cause more problems than it will cure. If you had to add that much refrigerant and oil, you have a serious leak and it needs to be repaired soon or did you have the system open. If you had it open, you need to use a vacuum pump to dehydrate the prior to recharging. R134a and the POE are very hygroscopic.

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Old 09-24-2007, 03:01 PM   #14
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Jim,

Thanks, That is how I also set the fans, blowing into the compartment. I wasn't sure which way they went since mine were both seized up.

Yes, I also bought the reusable gauge and can spigot, and yes, on a regular auto system I would say Yes, It is reading 25lbs, at the low end of the charged spectrum, which is exactly the same as it read before and after I put the can of 134a in. Most auto's only take about 3 cans of freon, so I didn't want to dump another can in since it didn't seem to have any effect by adding the can I did.

I am hesitant to add more since I don't have a high side gauge, and would hate to overfill the system and cause damage to the compressor.

Does anyone know the exact capacity or pressures for the system?

John
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